<template>
  <header class="header">
    <h1>todos</h1>
    <input id="toggle-all" class="toggle-all" type="checkbox" v-model="isAll">
    <label for="toggle-all"></label>
    <input
      class="new-todo"
      placeholder="输入任务名称-回车确认"
      autofocus
      @keydown.enter="downFn"
      v-model="task"
    />
  </header>
</template>

<script>
export default {
 data() {
  return {
    task:''
  }
 },
 methods: {
  downFn() {
    this.$emit('create',this.task)
    this.task = ""
  }

 },
 computed: {
  isAll: {
    set(checked) {
this.arr.forEach(obj => obj.isDone = checked)
    },
    get() {
return this.arr.length !== 0 && this.arr.every(obj => obj.isDone = true)
    }
  }
 },
 props:['arr']
}
</script>